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Use Telnet to troubleshoot email connectivity problems

Telnet is an Internet protocol that lets users log in to a remote computer with a user name and password.

Using a telnet connection can troubleshoot connectivity issues between an email server and an email client. Unsuccessful telnet connections indicate firewall or other connectivity issues. Running a telnet to one of the secure ports will fail, as that is intended due to it being secure.

Before You Start

You need to find out what your incoming and outgoing (SMTP) email servers are. To find your email servers: